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The wind-chill index is modeled by the function W = 13.12 + 0.6215T − 11.37v0.16 + 0.3965T v0.16
where T is the temperature (in â—¦C) and v is the wind speed (in km/h). When T = 215â—¦C and v = 30km/h, by how much would you expect the apparent temperature W to drop if the actual temperature decreases by 1â—¦C? What if the wind speed increases by 1 km/h?